WW stands for Weekend Wedding
Guest list had Clapper and Rice and a bunch of others, including Bob Bauer
In an email, Obama spokesperson Eric Schultz sends along the names of some other guests: “Susan Rice, Ian Cameron, James Clapper, Anita Dunn, Bob Bauer, Lisa Monaco, Denis McDonough, Karin Hillstrom, Anita Decker Breckenridge, Russ Breckendrige, Eric Schultz, Emily Blakemore, Sean Crotty, Stuart Murphy, Nick Mcquaid, Joe Paulsen, Samantha Tubman, Michael Bosworth, David Guggenheim, Jeff Zients, Mary Menell, Yohannes Abraham.”
https://www.washingtonian.com/2018/01/23/president-obama-officiated-at-a-wedding-in-dc-this-past-weekend/